Underclearer roll



Jan. 25, 1944:. c. H. CAMPBELL 2,339,977 v UNDERCLEARER ROLL I 5 Filed Nov. 8. 1 941 ,3nnentor CHARLES H.C AM FBELL Gttomeg Patented Jan. 25, 1944 UNDERCLEARER ROLL Charles H. Campbell, Hartsville, S. C., assignorto Sonoco v Products Company, a corporation of South Carolina Application November 8, 1941, Serial No. 418,293

2' Claims. My. invention relates'to scavenger or underclearer rollsfor use onspinning-frames .or, similar machines and more particularly to an arrangementof a wear resistant cap for protecting the ends of the underclearer roll.v

The underclearer roll 'of my invention is adapted for use on various types of spinning machines for, drawing and rewinding yarns, threads or other forms of fibers, andis-used in association with fluted metal drawing rolls. The underclearer roll performs thevfunctions drawing rolls by removing lint andvdust therefrom, and of picking up the broken ends'of yarn: as they come down from the fluted drawing rolls so that they will not wind around these rolls;

When the underclearer roll functions to wind-'- up the broken yarn coming from the steel drawing roll located above and near and the opposite end thereof is brought into damaging abrasive contact with the fluted boss of the satisfactory solution of which has not heretofore been attained.

In accordance with my invention I have perfected an arrangement of aprotective cap for the endsof the underclearer roll, of certainrelative hardness and size with respect to the fluted steel'drawing roll, such that the drawing roll cannot damage the underclearer roll, as above described, and at the same time the scavenging action of the underclearer roll is not diminished.

I have discovered that an advantageous type of cap for use in this arrangement is one made of, plastic having. a hardness intermediate that of the steel drawing roll and. the .wooden underclearer-roll.

The details of construction and mode of operation of my underclearer roll .will bemore clearly of cleaning theone end of theunderclearer roll, the underclearer roll is tilted problem which has stimulated previous attempts to correct this condition but understood from the following description taken in conjunction with the accompanying drawing in.

which:

Fig. l is an elevational view of my underclearer roll and asteel drawing roll and associated par-ts of. a, spinning frame, in -operative arrangement;

Fig. 2 is an elevational view :of: the underclearer rollzhaving agmotective cap at1each:.end;:

- opposite end of the roll it no longer suitable Fig. 3. is a longitudinal sectional'view ofz'thei underclearer roll assembly shown in Fig. 2;;

Fig. .4 is a perspective view of the' underclearer" rollcap from the open endof the cap; and;

Fig. 5 is a perspective viewof-the-outereorxsub' stantially closed end of thecap..

As shown in Fig.v 1, the underclearer roll all) has; wound on one end thereof a substantiall'amountuof yarn H, the weight of which has tilted: theroll l0, as indicated,such:thattheopposite end of the roll is in contact with the'fluted boss-s l2! of' the steel drawing roll l3; In actuahpractice this condition. often occurs, .sincethe spinning machine operator has to inspect several hundred; of these' drawing and rewinding units: and; keep;- the machine in operation. Consequently; he; fretquently does not reach in his regular inspection: an underclearer roll whichhas-been called upom to'function in the above described-manner. for. catching and winding the'broken strands of yarn: During the interim between the time the broken-1'; yarn begins to wind on the underclearer roll and: the time it is noticed and corrected by the opera tor, it will build up on one end or the other. of the underclearer roll depending upon the specifics location of the broken yarn with respect to the length of the underclearer roll. The several pieces of yarn drawn by thedrawing rolls H are; shown at 25.

Winding of the brokenyarn on one end of the; underclearer roll asshown in'Fig.,,1, upsets the: balance of the roll, which is normally maintainedi: in a position parallel with themetal drawing roll; l3 located above. As indicated, this causes: the

Ill to be pressedupwardi against the ab-rading end portion'of the fluted"; boss l 2. The usual result is that the steel filltin'gst or fine blade like projections which extend uni--- formly around the periphery of the boss i2 wi-lli abrade or cut the surfaceof the wooden-under; clearer roll over that end portion which is brought 2 into contact. It will have an even worse damag= ing efiect upon any paper or cloth coveringwhichf may be used on the underclearer roll and render for its intended function. For example, when the underclearer roll' is cleaned by the machine operator the'lintandiadhering fibers should be easily stripped from: the roll by hand and when the roll surface issmooth this can be effected. However, when-the end of the roll has become roughened or spline tered the fibers jagged edges of that portion andzprevent slipping of the fibers thereover.

Insaccordance with my inventioni I -OVGI1COIII6ihang or catch on the rough 011a" this problem by use of the protective cap M which is properly placed over each end of the underclearer roll I!) so as to engage the end boss flutings when the roll is tilted. The hardness, size and position of the caps on the underclearer roll relative to the fluted boss l2 are carefully controlled to effect this result. In this connection it will be noted from Fig. 1 that the last fluted boss l2 on the drawing roll l3 ends just immediately beyond the end of the lint receptive surface l and overlaps a short portion of the protective cap M. It is necessary to have the surface [5 extend laterally almost to the end of the flutings so as to pick up broken yarns originating there. At the same time this soft surface must not extend beyond the end of the flutings since it would be ruined by the abrading action thereof when the underclearer roll tilts.

The correct position of the end cap protecting surface with respect to the end of the fiutings in different spinning frames is controlled by varying the depth or lengthwise dimension of the cap. In different types of spinning frames the distance between the end boss on the drawing roll and the hanger, shown at l6, for the underclearer roll varies widely. Therefore the size of the caps l4v is varied accordingly, so that they will extend to a point just beyond the end of the fluted boss in each case.

The construction of the underclearer ID is illustrated in Figs. 2 and 3. It comprises a wooden roller or shaft 11, which is covered by a paper or similar fibrous tube IS. A protective cap characteristic of my invention is shown at M and as indicated in Fig. 2, it is positioned over each end of the wooden roller H. The paper or fibrous tube I5 is commonly used for the purpose of providing a softer and more efficient yarn engaging as well as lint receptive surface for the roller l1. In the illustrative but non-limiting embodiment shown in the drawing the sleeve or tubular member I5 is of slightly greater thickness than the protective cap l4 but it is to be understood that this thickness may vary either way in accordance with specific requirements of the underclearer roll in different machines. Also, the surface of the sleeve I5 may be worn down appreciably during use and may eventually coincide or become fiush with the caps 14. Allowance for this factor is generally made somewhat in the proportions illustrated in Fig. 3. Moreover, the sleeve may be removed from the roll for cleaning or for replacement by anew sleeve.

The protective caps M have appropriate inner diameters to fit easily over the ends of the wooden roller I]. These caps are this position by means ofpins l8 which are pointed at one end as shown and are driven into the wooden roller H. The caps M support the wooden core 11 when the pins l8 are driven therein and prevent the pins from splitting or cracking the core. The pins have discontinuous corrugations [9 which help to prevent them from pulling out of the wooden roller or core H. The pins also have located near the outer end a washer which may be integral with the pin It or otherwise attached thereto. The rounded portions of the pins 18 which extend beyond the caps M serve as trunnions which adapt the improved underclearer roll to be mounted in suitable hangers or bearings of the spinning machine, such as shown at it in Fig. 1.

It will be appreciated that other materials may be substituted for the wooden core IT and for the-paper sleeve l5 so long as the exposed surfirmly maintained in face of the roll and covering sleeve are suitable yarn and lint receiving surfaces and are adaptable for cleaning of the accumulated lint, yarn or waste thereon. The paper tube [5, for example, may be substituted in Whole or in part by cloth or felt.

In Figs. 4 and 5 the protective cap is illustrated in muchly enlarged size (as compared with the usual commercial size of the cap shown in Figs. 2 and 3) for the purpose of more clearly showin the constructional features of the cap. The cap 14 has a body portion 2| which determines the length or depth of the cap and this dimension is subject to variation with different types of machines as described above. In all events, however, this body portion of the cap I4 is of sufficient length to protect the underclearer roll from the abrading action of the steel drawing rolls, as above described.

The wall thickness of the cap indicated at 22 in Fig. 4 may vary between a minimum thickness necessary for mechanical strength of the caps or sufficient resistance to withstand the action of the fluted drawing roll, and a maximum thickness which will be regulated with relation to the thickness of the underclearer roll cover such as the paper tube 15. Normally the wall 22 should not be of substantially greater thickness than the paper tube l5 so as to enable easy removal of the lint or yarn from the tube by the usual hand stripping action. The aperture in the center of the cap for the pin I8 is indicated at 23. The outer end surface of the cap may have formed thereon a shoulder or slightly raised portion as indicated at 24 in Fig. 5. This shoulder may likewise be beveled as shown. It serves as a convenient stop or seat for the washer 2!]. When the pin I8 is inserted through the aperture 23 in the cap and is driven into the wooden roller I! as shown in Fig. 3, the washer 20 will seat itself upon the shoulder 24 and will thereby limit the penetration of the pin to the proper depth.

One of the essential characteristics of the caps I4 is that they possess a hardness which is greater than that of wood and less than that of the steel drawing rolls. Since the underclearer roll is normally made of wood, which is damaged by the fluted drawing rolls, the protective cap for the underclearer roll cannot be made of wood or of any other material of similar softness, such as pressed fiber. On the other hand, the underclearer roll cap is limited as to maximum hardness. For example, if the cap were made of metal such as steel there would result a metal to metal contact between the cap and fluted drawing roll which would damage the fine fluted surface of the drawing roll and thereby render it ineffective or at least inefficient for drawing the yarn.

I have discovered that a Very satisfactor can can be made of plastic material in the form of a molded or pressed resin composition which has been hardened by heat. The resin, for example, may be of a phenol or cresol formaldehyde type of resin containing an appreciable amount of filler such as wood flour, cotton linters, paper or paper pulp or other fillers commonly used in these resins. The resin may be plasticized as desired.

The protective cap may be made from various combinations of resin and filler and may be molded or pressed in various ways. The resin plasticized as desired which is to provide the necessary hardness to the cap may be used for example to impregnate paper stock and the thus impregnated material pressed or stamped into the desired shape and form of cap. Also, the resin may be combined with a filler to form a molding powder which can then be used in conventional manner to mold the cap in a suitably designed mold. Still another procedure for making the cap is to form it from a resin having little or no filler material, that is, consisting substantially completely of the resin itself.

Various modifications and changes may be made in the above described materials and constructions without departing from the scope of my invention, some of the novel features of which are defined in the appended claims.

I claim:

1. An underclearer roll which is adapted to cooperate with and be directly associated normally parallel to but at times tilting longitudinally with relation to the metal drawing roll in a spinning frame, said underclearer roll comprising a body core of uniform diameter throughout its length, and having a, relatively soft, yarn-engaging surface which may be easily and deleteriously abraded by the metal drawing roll when the underclearer roll is tilted and brought into contact therewith; and resinous, cylindrical, cupped, protective caps secured on the ends of said underclearer roll core With their inner ends abutting the yarn-engaging surface of the core, said caps being of such substantial length that they overlap to a considerable extent the adjacent ends of the working portion of said drawing roll and also extend a considerable distance outwardly therefrom, so as to protect said yarn-engaging surface at all times from said abrading action of the metal drawing roll, said protective caps being of an outside diameter less than that of the yarnengaging portion of the underclearer roll, and of a degree of hardness less than that of the drawing roll but harder than the yarn-engaging portion of the underclearer roll.

2. An underclearer roll as defined in claim 1 and in which the protective caps are made of a hardened thermosetting resin.

CHARLES H. CAMPBELL. 

